There are 4 US Post Offices in Cedar County serving a total of 15,430 residents equating to 3,858 residents per post office. It's estimated that approximately 24,628 packages are handled across the 4 county post offices annually. Cedar County is a county located in the southwest portion of the U.S. state of Missouri. As of the 2010 census, the population was 13,982. Its county seat is Stockton. The county was founded February 14, 1845, and named after Cedar Creek, a tributary of the Sac River, which in turn is named from the Eastern red cedar, a common tree of the area."